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| ==Summary==
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| ==Screenshot==
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| [[Image:Consumer.gif]]
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| ==Download Model==
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| Download the .scn, .sel and .lse files by clicking on the following link: [[Image:ProducerConsumer.zip]]
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| ==Model Code Exploration==
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| In the following sections we will examine all of the model files for this model. Note that instead of downloading the zip file above, you could just copy the text in the boxes below into a text editor and save it with the appropriate name (Section title). Opening the resulting .scn file in the SELES simulator would run this model.
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| ===Consume.scn===
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| Seles Scenario
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| Model.sel
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| SimPriority Low Priority
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| ===Model.sel===
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| Seles Model
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| Time Units: Step kiloStep 1000 1000
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| Landscape Events:
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| Producer.lse DEBUG
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| Consumer.lse DEBUG
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| Update.lse DEBUG
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| Spatial Variables:
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| LSState[3]
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| PrevLSState[3]
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| Legends:
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| LSStateTypes = {0:Uncolonised, 1:Producer, 2:Consumer}
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| Global Variables:
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| pInitialProducer = 0.01
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| pInitialConsumer = 0.01
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| pSpreadProducer = 0.1
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| pSpreadConsumer = 0.2
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| pDeathProducer = 0.01
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| pDeathConsumer = 0.05
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| // SpreadRateProducer = 1
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| // SpreadRateConsumer = 1
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| Output Frequency: 1
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| ===consumer.lse===
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| // Process based definition for consumber behaviour in producer/consumer model
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| LSEVENT: Consumder
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| DEFINITIONS
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| LAYER: LSState, PrevLSState
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| GLOBAL CONSTANT: Uncolonised, Producer, Consumer
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| GLOBAL VARIABLE: pInitialConsumer, pSpreadConsumer, pDeathConsumer //, SpreadRateConsumer
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| ENDDEF
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| // Just start once
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| RETURNTIME = 0
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| // Initialize in an empty cell
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| PROBINIT = IF LSState EQ Uncolonised THEN pInitialConsumer ELSE 0
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| TRANSITIONS
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| // Decide if this cell survives
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| Dies = UNIFORM(0,1) < pDeathConsumer
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| // If the consumer is dying
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| IF Dies
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| LSState = Uncolonised
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| ENDFN
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| TRANSITIONS = !Dies
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| LSState = Consumer
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| ENDTR
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| SPREADTIMESTEP = 1 //SpreadRateConsumer
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| SPREADLOCATION
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| REGION CENTRED(0,1, WRAPPED)
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| ENDSL
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| SPREADPROB
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| // Always spread to the same cell (self), and spread probabilistical to neighbouring producer cells
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| SPREADPROB = IF Location EQ (SOURCE Location) THEN 1
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| ELSE IF PrevLSState EQ Producer THEN pSpreadConsumer
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| ELSE 0
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| ENDSP
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| ===producer.lse===
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| // Process based definiton of producer behaviour in producer/consumer model
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| LSEVENT: Producer
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| DEFINITIONS
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| LAYER: LSState, PrevLSState
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| GLOBAL CONSTANT: Uncolonised, Producer, Consumer
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| GLOBAL VARIABLE: pInitialProducer, pSpreadProducer, pDeathProducer //, SpreadRateProducer
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| ENDDEF
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| // Just start once
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| RETURNTIME = 0
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| // Initialize in an empty cell
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| PROBINIT = IF LSState EQ Uncolonised THEN pInitialProducer ELSE 0
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| TRANSITIONS
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| // Decide if this cell survives
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| Dies = UNIFORM(0,1) < pDeathProducer
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| // If the producer is dying
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| IF Dies
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| LSState = Uncolonised
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| ENDFN
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| TRANSITIONS = (!Dies)
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| LSState = Producer
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| ENDTR
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| SPREADTIMESTEP = 1 //SpreadRateProducer
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| SPREADLOCATION
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| notEaten = PrevLSState EQ Producer // check that the producer wasn't eaten during the last step
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| REGION CENTRED(0, 1, WRAPPED)
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| DECISION notEaten // don't spread if eaten (i.e. stop process)
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| ENDSL
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| SPREADPROB
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| // Always spread to the same cell (self), and spread probabilistically to empty neighbouring cells
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| SPREADPROB = IF Location EQ (SOURCE Location) THEN 1 // spread to same cell
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| ELSE IF PrevLSState EQ Uncolonised THEN pSpreadProducer
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| ELSE 0
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| ENDSP
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| ===update.lse===
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| // Event to update time step
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| LSEVENT: Update
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| DEFINITIONS
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| LAYER: LSState, PrevLSState
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| ENDDEF
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| RETURNTIME
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| RETURNTIME = 1
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| PrevLSState = LSState
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| ENDRT
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| NUMCLUSTERS = 0
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| ==Suggested Experiments==
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| To explore this cellular automata model further, try the following:
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